Allowance for Loan Losses Allowance for Loan Losses and Total Recorded Investment in HFI Loans (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Jun. 30, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses for individually impaired loans	$ 32,602	[1]		$ 37,729	[1]
Allowance for loan losses for collectively reserved loans	4,329			6,117
Allowance for loan losses	36,931		39,067	43,846		45,169	49,643	58,795
Recorded investment in individually impaired loans	190,025	[1],[2]		193,279	[1],[2]
Recorded investment in collectively reserved loans	2,850,607	[2]		2,871,390	[2]
Total recorded investment in loans	3,040,632	[2]		3,064,669	[2]
Single-Family [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses for individually impaired loans	32,419	[1]		37,423	[1]
Allowance for loan losses for collectively reserved loans	4,151			5,884
Allowance for loan losses	36,570		38,643	43,307		44,476	48,770	57,687
Recorded investment in individually impaired loans	187,150	[1],[2]		189,064	[1],[2]
Recorded investment in collectively reserved loans	2,667,398	[2]		2,689,627	[2]
Total recorded investment in loans	2,854,548	[2]		2,878,691	[2]
Multifamily [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses for individually impaired loans	183	[1]		306	[1]
Allowance for loan losses for collectively reserved loans	178			233
Allowance for loan losses	361		424	539		693	873	1,108
Recorded investment in individually impaired loans	2,875	[1],[2]		4,215	[1],[2]
Recorded investment in collectively reserved loans	183,209	[2]		181,763	[2]
Total recorded investment in loans	$ 186,084	[2]		$ 185,978	[2]

[1] Includes acquired credit-impaired loans.

[2] Recorded investment consists of unpaid principal balance, unamortized premiums, discounts and other cost basis adjustments, and accrued interest receivable.